ios - 如果在 API 响应中被删除，则删除 Realm 对象条目

Question

我得到两个用户的第一个响应，即 abc@gmail.com 和 xyz@gmail.com

[{
       "email": "abc@gmail.com",
       "type": "primary_email",
       "linked_to": {
         "_id": "DAS44564dasdDASd",
         "image": null,
         "company": null,
         "designation": null,
         "name": null
       },
       "active_platforms": [
         "asd",
         "qwe"
       ]
     },
{
       "email": "xyz@gmail.com",
       "type": "primary_email",
       "linked_to": {
         "_id": "DAS44564dasdDASd",
         "image": null,
         "company": null,
         "designation": null,
         "name": null
       },
       "active_platforms": [
         "asd",
         "qwe"
       ]
     }]

现在，如果我再次调用 API 时 abc@gmail.com 被删除，那么我的对象中仍然会出现 abc@gmail.com，因为它没有从我的 Realm 中删除。那么如何处理这种情况呢？

        // write request result to realm database
        let entries = json["data"]
        realm.beginWrite()
        for (_, subJson) : (String, JSON) in entries {
            let entry: AppUsers = Mapper<AppUsers>().map(JSONObject: subJson.dictionaryObject!)!
            realm.add(entry, update: true)
        }

        do {
            try realm.commitWrite()
        } catch {

        }

Answer 1

更新您的逻辑如下。这是其中一种方法。

向 AppUsers 模型添加一个额外的 bool 字段，比如“active”。如下更新您的代码

  // write request result to realm database
    let entries = json["data"]
    realm.beginWrite()

   //Fetch all realm AppUsers objects
   let allAppUsers = //TODO fetch all AppUsers objects here
   for user in allAppUsers {
        user.active = false
   }

    for (_, subJson) : (String, JSON) in entries {
        let entry: AppUsers = Mapper<AppUsers>().map(JSONObject: subJson.dictionaryObject!)!
        entry.active = true
        realm.add(entry, update: true)
    }

        for user in allAppUsers {
            if !user.active {
                realm.delete(user)
            }
        }


    do {
        try realm.commitWrite()
    } catch {

    }